Combined Single-pass Conversion Of Methane Via Oxidative Coupling And Methane Dehydro-aromatization

Methan dehydroaromatization (MDA) and oxidative coupling of methane (OCM) are two ways for methane direct conversion without or with oxygen. They are all of significance in both potential industrial application and scientific reseach. In the present work, a combined single-pass conversion of methane via OCM MDA has been successfully developed. Under the selected reaction conditions, MDA reaction performances were improved greatly on Mo/HZSM-5, Mo/HMCM-22 and Mo/HMCM-49 catalysts via OCM reaction on SrO-La₂O₃/CaO or La₂O₃/BaO catalysts. The enhancement effect would be more prominent for MDA catalyst with better reaction performance. CO₂ and H₂O additive could restrain the coke on MDA catalysts, indicating that CO₂ and H₂O in-situ produced over the OCM catalysts would eliminate the amount of coke deposited on the MDA catalysts and would improve MDA reaction performance. CO or H₂ additive could eliminate the amount of coke on Mo-based zeolite catalysts in MDA reaction. The reaction performance of single-pass conversion of methane via OCM and MDA fits that with CO and H₂ co-additive well. Therefore, single-pass conversion of methane via OCM and MDA was possibly realized through CO and H₂ produced from reforming reaction between CO₂, H₂O and C2H6, C2H4, CH4.In the present work, silanation by chemical liquid deposition (CLD) method and post-steam method were employed to modify HMCM-22 and Mo/HMCM-22,...